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Senescence-associated secretory phenotype contributes to pathological angiogenesis in retinopathy.

Abstract：

:Pathological angiogenesis is the hallmark of diseases such as cancer and retinopathies. Although tissue hypoxia and inflammation are recognized as central drivers of vessel growth, relatively little is known about the process that bridges the two. In a mouse model of ischemic retinopathy, we found that hypoxic regions of the retina showed only modest rates of apoptosis despite severely compromised metabolic supply. Using transcriptomic analysis and inducible loss-of-function genetics, we demonstrated that ischemic retinal cells instead engage the endoplasmic reticulum stress inositol-requiring enzyme 1α (IRE1α) pathway that, through its endoribonuclease activity, induces a state of senescence in which cells adopt a senescence-associated secretory phenotype (SASP). We also detected SASP-associated cytokines (plasminogen activator inhibitor 1, interleukin-6, interleukin-8, and vascular endothelial growth factor) in the vitreous humor of patients suffering from proliferative diabetic retinopathy. Therapeutic inhibition of the SASP through intravitreal delivery of metformin or interference with effectors of senescence (semaphorin 3A or IRE1α) in mice reduced destructive retinal neovascularization in vivo. We conclude that the SASP contributes to pathological vessel growth, with ischemic retinal cells becoming prematurely senescent and secreting inflammatory cytokines that drive paracrine senescence, exacerbate destructive angiogenesis, and hinder reparative vascular regeneration. Reversal of this process may be therapeutically beneficial.

journal_name

Sci Transl Med

journal_title

Science translational medicine

authors

Oubaha M,Miloudi K,Dejda A,Guber V,Mawambo G,Germain MA,Bourdel G,Popovic N,Rezende FA,Kaufman RJ,Mallette FA,Sapieha P

doi

10.1126/scitranslmed.aaf9440

subject

Has Abstract

pub_date

2016-10-26 00:00:00

pages

362ra144

issue

362

eissn

1946-6234

issn

1946-6242

pii

8/362/362ra144

journal_volume

8

pub_type

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